The Access Check tool helps you find out why a site won't open — from your own perspective, from inside Iran, and (when needed) from outside.

It combines checks from your browser, an Iran-based probe, and optionally an external probe and a full multi-provider DNS sweep. When you need to go deeper, it can also download a small local diagnostic script that runs on your own computer.

1. Enter a URL (e.g., `example.com` or `https://example.com/path`)
2. Click "Run Diagnostic"
3. Review the results

Optionally, check “Also run an advanced local diagnostic” to download a script you can inspect before running.

To keep the common case cheap, the tool runs checks in stages:

• Every run — an atrin01 (Iran) check is performed. Small fixed cost.
• Only if something looks wrong — the external probe and the full DNS provider sweep run automatically.

This means a healthy site costs very little to check, and only a broken one triggers the deeper (and more expensive) investigations.

When you check the box, Access Check downloads a small script to your computer. You can read it before running it — it is plain text.

What the script does:

• Reads your DNS servers
• Reads your proxy settings
• Runs a ping and traceroute to the target
• Lists the root certificates Windows trusts

What it does not do:

• ❌ Does not send anything to Telenegar or anywhere else
• ❌ Does not read private keys or passwords
• ❌ Does not modify your system

The script writes a single file on your own computer. You choose whether to attach that file back into Access Check, where it is read entirely inside your own browser — it is never uploaded.

Many “site is down” problems are actually local — a wrong DNS server, a proxy misconfiguration, a system clock that's off, or a missing root certificate. Access Check separates local problems from real network or server problems.

For example:

• Reachable from Iran, not from outside → possibly a filtering or routing issue
• Reachable from outside, not from Iran → possibly a domestic filtering or routing issue
• Reachable from probes, not from your browser → likely a problem on your side
• Not reachable from anywhere → the site is likely genuinely down

Try the Access Check Tool →

tool accesscheck diagnostics iran